Cerebral Ventricles

**Definition:** Four CSF-filled (see CEREBROSPINAL FLUID) cavities within the cerebral hemispheres (LATERAL VENTRICLES), in the midline (THIRD VENTRICLE) and within the PONS and MEDULLA OBLONGATA (FOURTH VENTRICLE).

**Tree numbers:** - A08.186.211.140

**Synonyms:** - Cerebral Ventricular System